<template>
  <div>
    <div id="breadcrumbs">
      <router-link to="/files/">
        <i class="material-icons">home</i>
      </router-link>

      <span v-for="link in breadcrumbs" :key="link.name">
        <span class="chevron"><i class="material-icons">keyboard_arrow_right</i></span>
        <router-link :to="link.url">{{ link.name }}</router-link>
      </span>
    </div>
    <div v-if="error">
      <not-found v-if="error === 404"></not-found>
      <forbidden v-else-if="error === 403"></forbidden>
      <internal-error v-else></internal-error>
    </div>
    <editor v-else-if="isEditor"></editor>
    <listing :class="{ multiple }" v-else-if="isListing"></listing>
    <preview v-else-if="isPreview"></preview>
    <div v-else>
      <h2 class="message">
        <span>Loading...</span>
      </h2>
    </div>
  </div>
</template>

<script>
import Forbidden from './errors/403'
import NotFound from './errors/404'
import InternalError from './errors/500'
import Preview from './Preview'
import Listing from './Listing'
import Editor from './Editor'
import api from '@/utils/api'
import { mapGetters, mapState, mapMutations } from 'vuex'

export default {
  name: 'files',
  components: {
    Forbidden,
    NotFound,
    InternalError,
    Preview,
    Listing,
    Editor
  },
  computed: {
    ...mapGetters([
      'selectedCount'
    ]),
    ...mapState([
      'req',
      'user',
      'reload',
      'multiple',
      'loading'
    ]),
    isListing () {
      return this.req.kind === 'listing' && !this.loading
    },
    isPreview () {
      return this.req.kind === 'preview' && !this.loading
    },
    isEditor () {
      return this.req.kind === 'editor' && !this.loading
    },
    breadcrumbs () {
      let parts = this.$route.path.split('/')

      if (parts[0] === '') {
        parts.shift()
      }

      if (parts[parts.length - 1] === '') {
        parts.pop()
      }

      let breadcrumbs = []

      for (let i = 0; i < parts.length; i++) {
        if (i === 0) {
          breadcrumbs.push({ name: decodeURIComponent(parts[i]), url: '/' + parts[i] + '/' })
        } else {
          breadcrumbs.push({ name: decodeURIComponent(parts[i]), url: breadcrumbs[i - 1].url + parts[i] + '/' })
        }
      }

      breadcrumbs.shift()

      if (breadcrumbs.length > 3) {
        while (breadcrumbs.length !== 4) {
          breadcrumbs.shift()
        }

        breadcrumbs[0].name = '...'
      }

      return breadcrumbs
    }
  },
  data: function () {
    return {
      error: null
    }
  },
  created () {
    this.fetchData()
  },
  watch: {
    '$route': 'fetchData',
    'reload': function () {
      this.fetchData()
    }
  },
  mounted () {
    window.addEventListener('keydown', this.keyEvent)
    window.addEventListener('scroll', event => {
      if (this.req.kind !== 'listing' || this.$store.state.req.display === 'mosaic') return

      let top = 112 - window.scrollY

      if (top < 64) {
        top = 64
      }

      document.querySelector('#listing.list .item.header').style.top = top + 'px'
    })
  },
  beforeDestroy () {
    window.removeEventListener('keydown', this.keyEvent)
  },
  destroyed () {
    this.$store.commit('updateRequest', {})
  },
  methods: {
    ...mapMutations([ 'setLoading' ]),
    fetchData () {
      // Reset view information.
      this.$store.commit('setReload', false)
      this.$store.commit('resetSelected')
      this.$store.commit('multiple', false)
      this.$store.commit('closeHovers')

      // Set loading to true and reset the error.
      this.setLoading(true)
      this.error = null

      let url = this.$route.path
      if (url === '') url = '/'
      if (url[0] !== '/') url = '/' + url

      api.fetch(url)
      .then((req) => {
        if (!url.endsWith('/') && req.url.endsWith('/')) {
          window.history.replaceState(window.history.state, document.title, window.location.pathname + '/')
        }

        this.$store.commit('updateRequest', req)
        document.title = req.name
        this.setLoading(false)
      })
      .catch(error => {
        this.setLoading(false)

        if (typeof error === 'object') {
          this.error = error.status
          return
        }

        this.error = error
      })
    },
    keyEvent (event) {
      // Esc!
      if (event.keyCode === 27) {
        this.$store.commit('closeHovers')

        // If we're on a listing, unselect all
        // files and folders.
        if (this.req.kind === 'listing') {
          this.$store.commit('resetSelected')
        }
      }

      // Del!
      if (event.keyCode === 46) {
        if (this.req.kind === 'editor' ||
          this.$route.name !== 'Files' ||
          this.loading ||
          !this.user.allowEdit ||
          (this.req.kind === 'listing' && this.selectedCount === 0)) return

        this.$store.commit('showHover', 'delete')
      }

      // F1!
      if (event.keyCode === 112) {
        event.preventDefault()
        this.$store.commit('showHover', 'help')
      }

      // F2!
      if (event.keyCode === 113) {
        if (this.req.kind === 'editor' ||
          this.$route.name !== 'Files' ||
          this.loading ||
          !this.user.allowEdit ||
          (this.req.kind === 'listing' && this.selectedCount === 0) ||
          (this.req.kind === 'listing' && this.selectedCount > 1)) return

        this.$store.commit('showHover', 'rename')
      }

      // CTRL + S
      if (event.ctrlKey || event.metaKey) {
        if (String.fromCharCode(event.which).toLowerCase() === 's') {
          event.preventDefault()

          if (this.req.kind !== 'editor') {
            document.getElementById('download-button').click()
            return
          }
        }
      }
    },
    openSidebar () {
      this.$store.commit('showHover', 'sidebar')
    },
    openSearch () {
      this.$store.commit('showHover', 'search')
    }
  }
}
</script>
